<div class="book-brand">
    {{- if .Site.Params.BookDesktopLogo -}}
    <div class="book-logo-desktop">
      <a href="{{ .Site.BaseURL | relLangURL }}">
        <img src="{{ .Site.Params.BookDeskTopLogo | relURL }}" alt="Logo" />
      </a>
    </div>
      {{- if .Site.Params.BookMobileLogo -}}
      <div class="book-logo-mobile">
        <a href="{{ .Site.BaseURL | relLangURL }}">
          <img src="{{ .Site.Params.BookMobileLogo | relURL }}" alt="Logo" />
        </a>
      </div>
      {{- else -}}
      <div class="book-logo-mobile">
        <a href="{{ .Site.BaseURL | relLangURL }}">
          <img src="{{ .Site.Params.BookDesktopLogo | relURL }}" alt="Logo" />
        </a>
      </div>
      {{- end -}}
    {{- else if .Site.Params.BookLogo -}}
    <div class="book-logo-desktop ">
      <a href="https://ones.ai">
        <img src="{{ .Site.Params.BookLogo | relURL }}" alt="Logo" />
      </a>
      <div class="divide"></div>
      <a href="{{ .Site.BaseURL | relLangURL }}">
        <span class="help-text">帮助中心</span>
      </a>
    </div>
    <div class="book-logo-mobile">
      <a href="https://ones.ai">
        <img src="{{ .Site.Params.BookLogo | relURL }}" alt="Logo" />
      </a>
      <div class="divide"></div>
      <a href="{{ .Site.BaseURL | relLangURL }}">
        <span class="help-text">帮助中心</span>
      </a>
    </div>
    {{- else -}}
    <a href="{{ .Site.BaseURL | relLangURL }}">
      {{ .Site.Title }}
    </a>
    {{- end -}}
  </a>
</div>